[Pvfs2-developers] PVFS2 Performance Problem -

[David Bonnie]

Hello all -

I'm having trouble figuring out a problem with performance depredation on a
simple 10 node cluster.  Prior runs on the cluster (before this problem
manifested itself) resulted in bandwidth and IOPS about 10 times higher on a
small file creation workload.  Each node is running as a metadata server and
a data server.

The problem is persistent between versions and installations of PVFS2 2.8.0
and 2.8.1.  Rebooting all of the nodes didn't improve anything.  The network
connections (simple GigE) showed no errors or dropped packets.  Using
different physical disks (both SAS and FC) didn't improve things.  The
kernel logs didn't show anything out of place nor did the pvfs2 server or
client logs.  It seems like a network issue but I can't seem to find
anything wrong with any of the connections.

Has anyone seen this kind of problem before?  I seem to remember something
on the list before about performance suddenly dropping but I can't find the
message now (of course).  Any insight would be appreciated!

Thanks,

- Dave
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